- ID:
- ivo://CDS.VizieR/J/ApJS/215/26
- Title:
- Energy levels and transition rates of C-like ions
- Short Name:
- J/ApJS/215/26
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Based on systematic calculations using a combined relativistic configuration interaction and a many-body perturbation theory (MBPT) approach, we provide a complete and consistent data set for 46 levels belonging to the 2s^2^2p^2^, 2s2p^3^, 2p^4^, 2s^2^2p3s, 2s^2^2p3p, and 2s^2^2p3d configurations in C-like ions with 13<=Z<=36. The data set includes energy levels as well as electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole transition properties. Extensive comparisons with available observed and calculated results are made and indicate that the present MBPT calculations are highly accurate. The present data set can be used reliably for many purposes, such as the line identification of observed spectra, and modeling and diagnostics of astrophysical and fusion plasmas.
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- ID:
- ivo://CDS.VizieR/J/ApJS/238/34
- Title:
- Energy levels for L-shell ions of sulfur & argon
- Short Name:
- J/ApJS/238/34
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Calculated level energies for valence and K-vacancy states are provided for the ion series SVII-SXIV and ArIX-ArXVI. The calculations were performed with the relativistic Multi-Reference Moller-Plesset Perturbation Theory method (MR-MP). The data set includes all the level energies with configurations 1s^2^2(s,p)^q^, 1s^2^2(s,p)^q-1^nl, 1s^1^2(s,p)^q+1^, 1s^1^2(s,p)^q^nl, 2(s,p)^q+2^, and 2(s,p)^q+1^nl, where 1<=q<=8, n<=5, and l<=3. We have compared our results with data from the National Institute of Standards and Technology (NIST) online database and with previous calculations. The average deviation of valence level energies ranges from 0.16eV in Ne-like ions to 0.01eV in Li-like ions, showing that the present MR-MP valence level energies are highly accurate. In the case of K-vacancy states, the deviation is generally below 0.3eV for Li-like SXIV and ArXVI. The deviation for K-vacancy energies in other L-shell ions (Be-, B-, C-, N-, and O-like Ar ions) is higher but likely because the NIST-recommended values have a higher uncertainty. The data set includes many n=4 and n=5 valence and K-vacancy levels in L-shell ions of S and Ar that have not been previously reported. The data can be used for line identification and modeling of L-shell ions of S and Ar in astrophysical and laboratory-generated plasmas, and as energy references in the absence of more accurate laboratory measurements.
- ID:
- ivo://CDS.VizieR/J/ApJS/231/19
- Title:
- Energy levels of ionized vanadium (V II)
- Short Name:
- J/ApJS/231/19
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The energy levels, observed spectral lines, and transition probabilities of singly ionized vanadium, V II, have been compiled. The experimentally derived energy levels belong to the configurations 3d^4^, 3d^3^ns (n=4,5,6), 3d^3^np, and 3d^3^nd (n=4,5), 3d^3^4f, 3d^2^4s^2^, and 3d^2^4s4p. Also included are values for some forbidden lines that may be of interest to the astrophysical community. Experimental Lande g-factors and leading percentages for the levels are included when available, as well as Ritz wavelengths calculated from the energy levels. Wavelengths and transition probabilities are reported for 3568 and 1896 transitions, respectively. From the list of observed wavelengths, 407 energy levels are determined. The observed intensities, normalized to a common scale, are provided. From the newly optimized energy levels, a revised value for the ionization energy is derived, 118,030(60)cm^-1^, corresponding to 14.634(7)eV. This is 130cm^-1^ higher than the previously recommended value from Iglesias+ (1988, Publ. Inst. Opt. Madrid 47 1).
- ID:
- ivo://CDS.VizieR/J/ApJS/231/18
- Title:
- Energy levels & spectral lines of vanadium (V I)
- Short Name:
- J/ApJS/231/18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The energy levels, observed spectral lines, and transition probabilities of the neutral vanadium atom, V I, have been compiled. Also included are values for some forbidden lines that may be of interest to the astrophysical community. Experimental Lande g-factors and leading percentage compositions for the levels are included where available, as well as wavelengths calculated from the energy levels (Ritz wavelengths). Wavelengths are reported for 3985 transitions, and 549 energy levels are determined. The observed relative intensities normalized to a common scale are provided.
- ID:
- ivo://CDS.VizieR/J/ApJS/227/16
- Title:
- Energy levels & transition rates for F-like ions
- Short Name:
- J/ApJS/227/16
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have performed extensive multiconfiguration Dirac-Hartree-Fock calculations and second-order many-body perturbation calculations for F-like ions with Z=24-30. Energy levels and transition rates for electric dipole (E1), electric-quadrupole (E2), electric-octupole (E3), magnetic dipole (M1), and magnetic-quadrupole (M2) transitions, as well as radiative lifetimes, are provided for the lowest 200 levels belonging to the 1s^2^2s^2^2p^5^, 1s^2^2s2p^6^, 1s^2^2s^2^2p^4^3l, 1s^2^2s2p^5^3l, 1s^2^2p^6^3l, and 1s^2^2s^2^2p^4^4l configurations of each ion. The results from the two sets of calculations are in excellent agreement. Extensive comparisons are also made with other theoretical results and observed data from the CHIANTI and NIST databases. The present energies and wavelengths are believed to be accurate enough to aid line identifications involving the n=3 and n=4 configurations, for which observations are largely missing. The calculated wavelengths and transition data will be useful in the modeling and diagnostics of astrophysical and fusion plasmas.
- ID:
- ivo://CDS.VizieR/J/ApJS/235/27
- Title:
- Energy levels & transition rates for P-like ions
- Short Name:
- J/ApJS/235/27
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The fully relativistic multiconfiguration Dirac-Hartree-Fock method is used to compute excitation energies and lifetimes for the 143 lowest states of the 3s^2^3p^3^, 3s3p^4^, 3s^2^3p^2^3d, 3s3p^3^3d, 3p^5^, 3s^2^3p3d^2^ configurations in P-like ions from Cr X to Zn XVI. Multipole (E1, M1, E2, M2) transition rates, line strengths, oscillator strengths, and branching fractions among these states are also given. Valence-valence and core-valence electron correlation effects are systematically accounted for using large basis function expansions. Computed excitation energies are compared with the NIST ASD and CHIANTI compiled values and previous calculations. The mean average absolute difference, removing obvious outliers, between computed and observed energies for the 41 lowest identified levels in Fe XII, is only 0.057%, implying that the computed energies are accurate enough to aid identification of new emission lines from the Sun and other astrophysical sources. The amount of energy and transition data of high accuracy are significantly increased for several P-like ions of astrophysics interest, where experimental data are still very scarce.
- ID:
- ivo://CDS.VizieR/J/ApJS/218/16
- Title:
- Energy levels & transition rates of Be-like ions
- Short Name:
- J/ApJS/218/16
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report calculations of energy levels and radiative rates for transitions among the lowest 116 fine-structure levels arising from the n<=5 configurations in Be-like ions with Z=10-30. The wavelengths, oscillator strengths, line strengths, and radiative rates for all possible electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole transitions among the 116 levels have been calculated using the combined configuration interaction and many-body perturbation method. The accuracy of the results is determined through extensive comparisons with existing laboratory measurements and theoretical results. The present complete set of results should be of great help in line identification and the interpretation of spectra, as well as in the modeling and diagnostics of astrophysical and fusion plasmas.
- ID:
- ivo://CDS.VizieR/J/ApJS/229/37
- Title:
- Energy levels & transition rates of O-like ions
- Short Name:
- J/ApJS/229/37
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Employing two state-of-the-art methods, multiconfiguration Dirac-Hartree-Fock and second-order many-body perturbation theory, the excitation energies and lifetimes for the lowest 200 states of the 2s^2^2p^4^, 2s2p^5^, 2p^6^, 2s^2^2p^3^3s, 2s^2^2p^3^3p, 2s^2^2p^3^3d, 2s2p^4^3s, 2s2p^4^3p, and 2s2p^4^3d configurations, and multipole (electric dipole (E1), magnetic dipole (M1), and electric quadrupole (E2)) transition rates, line strengths, and oscillator strengths among these states are calculated for each O-like ion, from CrXVII to ZnXXIII. Our two data sets are compared with the National Institute of Standards and Technology and CHIANTI compiled values, and previous calculations. The data are accurate enough for identification and deblending of new emission lines from the Sun and other astrophysical sources. The amount of high-accuracy data is significantly increased for the n=3 states of several O-like ions of astrophysical interest, where experimental data are very scarce.
- ID:
- ivo://CDS.VizieR/J/MNRAS/465/2471
- Title:
- Enhanced momentum feedback from clustered SN
- Short Name:
- J/MNRAS/465/2471
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Young stars typically form in star clusters, so the supernovae (SNe) they produce are clustered in space and time. This clustering of SNe may alter the momentum per SN deposited in the interstellar medium (ISM) by affecting the local ISM density, which in turn affects the cooling rate. We study the effect of multiple SNe using idealized 1D hydrodynamic simulations which explore a large parameter space of the number of SNe, and the background gas density and metallicity. The results are provided as a table and an analytic fitting formula. We find that for clusters with up to ~100 SNe, the asymptotic momentum scales superlinearly with the number of SNe, resulting in a momentum per SN which can be an order of magnitude larger than for a single SN, with a maximum efficiency for clusters with 10-100 SNe. We argue that additional physical processes not included in our simulations - self-gravity, breakout from a galactic disc, and galactic shear - can slightly reduce the momentum enhancement from clustering, but the average momentum per SN still remains a factor of 4 larger than the isolated SN value when averaged over a realistic cluster mass function for a star-forming galaxy. We conclude with a discussion of the possible role of mixing between hot and cold gas, induced by multidimensional instabilities or pre-existing density variations, as a limiting factor in the build-up of momentum by clustered SNe, and suggest future numerical experiments to explore these effects.
- ID:
- ivo://CDS.VizieR/IX/47
- Title:
- Enhanced 3XMM catalogue (3XMMe)
- Short Name:
- IX/47
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The enhanced 3XMM catalogue (designated 3XMMe) is one of the core elements of the Arches project, representing the X-ray source basis for the cross-correlations with other multi-wavelength catalogues. The 3XMMe catalogue is a derivative of the latest increment of the 3XMM catalogue, i.e. 3XMM-DR5, that was publicly released in April 2015 (Rosen et al., 2016A&A...590A...1R, Cat. XI/46)), tailored for the purposes of the Arches project. The 3XMM-DR5 catalogue, available from the XMM-Newton Science Archive (http://xmm.esac.esa.int/xsa/), the XMM-Newton Survey Science Centre (SSC) (http://xmmssc.irap.omp.eu) and other sites listed on the SSC site, contains 565962 detections arising from 396910 unique sources drawn from 7781 XMM observations. These numbers include detections from 356 sub-pointings made in mosaic mode. Arches wed site : http://www.arches-fp7.eu .